210021010901 has 4 divisors (see below), whose sum is σ = 226176473292. Its totient is φ = 193865548512.

The previous prime is 210021010883. The next prime is 210021010931. The reversal of 210021010901 is 109010120012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97478206225 + 112542804676 = 312215^2 + 335474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021010901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210021010901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021010931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8077731176 + ... + 8077731201.

It is an arithmetic number, because the mean of its divisors is an integer number (56544118323).

Almost surely, 2^210021010901 is an apocalyptic number.

It is an amenable number.

210021010901 is a deficient number, since it is larger than the sum of its proper divisors (16155462391).

210021010901 is a wasteful number, since it uses less digits than its factorization.

210021010901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16155462390.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 210021010901 its reverse (109010120012), we get a palindrome (319031130913).

The spelling of 210021010901 in words is "two hundred ten billion, twenty-one million, ten thousand, nine hundred one".